Owner

Current status

Detailed Description

GCC 10 is currently in stage3, switching to stage4 in January, at which point it will be in a prerelease state with only regression bugfixes and documentation fixes allowed. The release will happen probably in the middle of April. rpms will be built in early January, but Jeff Law has been testing x86_64 Fedora test mass rebuilds with GCC 10 snapshots for a while.

Perform a mass rebuild, which will be needed for the LTO System Wide change too.

Policies and guidelines: N/A (not a System Wide Change)

I don't think so, this is a usual system compiler update that is being done every year. I think we have skipped GCC 4.2, so in Fedora this is likely the 15th such System Wide change.

Trademark approval: N/A (not needed for this Change)

Upgrade/compatibility impact

No impact

How To Test

GCC has its own testsuite, which is run during the package build, plus many other packages with automated tests also help to test the new gcc.

User Experience

Users will be able to see compiled code improvements and use the newly added features.
Developers will notice a newer compiler, and might need to adjust their codebases acording to http://gcc.gnu.org/gcc-10/porting_to.html, or, if they detect a GCC bug, report it.

Dependencies

libtool, annobin, gcc-python-plugin depend on exact gcc version, those need to be rebuilt.

Contingency Plan

If bugs are discovered, I'd appreciate help from the package owners in preparing self-contained testcases to speed up analysis and fixing the bugs. Don't have time to debug issues in 12000+ packages, especially when in many cases it could be caused by undefined code in the packages etc. I don't expect we'll have to fall back to the older gcc, we've never had to do it in the past,
but worst case we can mass rebuild everything with older gcc again.
Jeff Law has performed test mass rebuild on x86_64.

Contingency mechanism: (What to do? Who will do it?) Revert to older gcc, mass rebuild everything again